diff --git a/src/tr1/copysign.cpp b/src/tr1/copysign.cpp
index 21fdbd67a..67f956e7e 100644
--- a/src/tr1/copysign.cpp
+++ b/src/tr1/copysign.cpp
@@ -11,7 +11,7 @@
 #include <boost/math/special_functions/sign.hpp>
 #include "c_policy.hpp"
 
-#if !(defined(__HP_aCC) && (__HP_aCC >= 61400))
+#if !(defined(__HP_aCC) && (__HP_aCC >= 61000))
 
 extern "C" double BOOST_MATH_TR1_DECL copysign BOOST_PREVENT_MACRO_SUBSTITUTION(double x, double y) BOOST_MATH_C99_THROW_SPEC
 {
diff --git a/src/tr1/copysignf.cpp b/src/tr1/copysignf.cpp
index 9feb834b8..5f05b906b 100644
--- a/src/tr1/copysignf.cpp
+++ b/src/tr1/copysignf.cpp
@@ -11,7 +11,7 @@
 #include <boost/math/special_functions/sign.hpp>
 #include "c_policy.hpp"
 
-#if !(defined(__HP_aCC) && (__HP_aCC >= 61400))
+#if !(defined(__HP_aCC) && (__HP_aCC >= 61000))
 
 extern "C" float BOOST_MATH_TR1_DECL copysignf BOOST_PREVENT_MACRO_SUBSTITUTION(float x, float y) BOOST_MATH_C99_THROW_SPEC
 {
diff --git a/src/tr1/fmaxf.cpp b/src/tr1/fmaxf.cpp
index 35e19a6a2..f64110a81 100644
--- a/src/tr1/fmaxf.cpp
+++ b/src/tr1/fmaxf.cpp
@@ -11,7 +11,7 @@
 #include <boost/math/special_functions/fpclassify.hpp>
 #include "c_policy.hpp"
 
-#if !(defined(__HP_aCC) && (__HP_aCC >= 61400))
+#if !(defined(__HP_aCC) && (__HP_aCC >= 61000))
 
 extern "C" float BOOST_MATH_TR1_DECL fmaxf BOOST_PREVENT_MACRO_SUBSTITUTION(float x, float y) BOOST_MATH_C99_THROW_SPEC
 {
diff --git a/src/tr1/fminf.cpp b/src/tr1/fminf.cpp
index cbf1adc87..66b3c4bee 100644
--- a/src/tr1/fminf.cpp
+++ b/src/tr1/fminf.cpp
@@ -11,7 +11,7 @@
 #include <boost/math/special_functions/fpclassify.hpp>
 #include "c_policy.hpp"
 
-#if !(defined(__HP_aCC) && (__HP_aCC >= 61400))
+#if !(defined(__HP_aCC) && (__HP_aCC >= 61000))
 
 extern "C" float BOOST_MATH_TR1_DECL fminf BOOST_PREVENT_MACRO_SUBSTITUTION(float x, float y) BOOST_MATH_C99_THROW_SPEC
 {